Question

what did the interstate commerce act ban in 1887?
railroad pools
interstate railroads
steel monopolies
sugar - refining monopolies

Explanation:

The Interstate Commerce Act of 1887 was aimed at regulating railroad practices. Railroad pools were agreements among railroads to divide business or set rates, and the act banned such pools to promote fair competition in interstate railroad commerce. Interstate railroads themselves were not banned (they were the subject of regulation), and the act was not about steel or sugar - refining monopolies.

Answer:

A. railroad pools